GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

ATF temperature sensor

Refer to DTC 17

Line pressure solenoid

Refer to DTC 48

Shift switch positioning

Refer to Park/Neutral Position Switch Replacement

Transmission control module (TCM)

Refer to Diagnostic System Check - Automatic Transmission .

Reverse clutch

Burn or wear of the low clutch. Refer to Reverse Clutch Disassemble .

Low and reverse clutch

Burn or wear of the low and reverse clutch

Broken or damaged oil pump

Seized or broken pump gears

Control valve spool

Missing steel ball in control valve